Remove incorrect warning about FILTER_CALLBACK flags#5243
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The documentation incorrectly stated that FILTER_CALLBACK cannot be used with filter flags like FILTER_NULL_ON_FAILURE. In practice, these flags do affect the behavior of FILTER_CALLBACK. Fixes php#2708
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Fixes #2708
Remove incorrect statement that FILTER_CALLBACK cannot be used with filter flags like FILTER_NULL_ON_FAILURE.